Angela Rodriguez | (TNS) The Sacramento Bee While many respiratory viruses — including COVID-19, RSV and influenza — circulate year-round in California, they are typically more active between October and March, according to the California Department of Public Health. You might be wondering whether your cold-like symptoms might be coronavirus, and whether you can use the old at-home test in your medicine cabinet. Can you use an at-home COVID-19 test past its expiration date — and can it be extended? Here’s what you need to know: Do at-home COVID-19 tests really expire? According to the U.S.